d2i_DSAparams(), i2d_DSAparams() decode and encode the DSA parameters using
a Dss-Parms structure as defined in RFC2459.

d2i_DSA_SIG(), i2d_DSA_SIG() decode and encode a DSA signature using a
Dss-Sig-Value structure as defined in RFC2459.

The usage of all of these functions is similar to the d2i_X509() and
i2d_X509() described in the d2i_X509(3) manual page.

NOTES

The DSA structure passed to the private key encoding functions should have
all the private key components present.

The data encoded by the private key functions is unencrypted and therefore
offers no private key security.

The DSA_PUBKEY functions should be used in preference to the DSAPublicKey
functions when encoding public keys because they use a standard format.

The DSAPublicKey functions use an non standard format the actual data encoded
depends on the value of the write_params field of the a key parameter.
If write_params is zero then only the pub_key field is encoded as an
INTEGER. If write_params is 1 then a SEQUENCE consisting of the
p, q, g and pub_key respectively fields are encoded.

The DSAPrivateKey functions also use a non standard structure consiting
consisting of a SEQUENCE containing the p, q, g and pub_key and
priv_key fields respectively.